Tranquil Wanderer

Sunburst (This enters the battlefield with a +1/+1 counter on it for each colour of mana spent to cast it.)
Frantic (As you cast this spell, you may exile up to
X cards from the top of your library, where X is the
amount of generic mana in this spell's mana value.
This spell costs {1} less for each card exiled this way.)
When Tranquil Wanderer enters the battlefield,
search your library for a basic land card, reveal it
and put it into your hand, then shuffle.